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Selecting the Correct Prescription for your Swim Goggles

Updated: Oct 10, 2023

If you wear glasses, you might have wondered how to choose the right prescription for your swimming goggles. Having clear vision is essential for your safety and enjoyment. Although prescription goggles may have been big and bulky in the past, today’s models are lightweight and attractive. In this blog post, we will explain how to select the correct prescription for goggles and what factors to consider when buying them.

Knowing your prescription The first step is to know your current prescription. You can get this from your eye doctor or from your glasses prescription. However, keep in mind that your glasses prescription might not be the same as your goggles prescription. This is because glasses are usually worn at a distance of about 12 mm from your eyes, while goggles are worn much closer. This difference can affect how your eyes focus and how much correction you need. To find out your goggles prescription, you can use a conversion chart or an online calculator. These tools will help you adjust your glasses prescription to account for the distance and the refraction of water or air. For example, if you have a glasses prescription of -3.00 diopters (D) for both eyes, your goggles prescription might be around -2.50 D or -2.75 D, depending on the type and fit of your goggles.

Shape and size of goggles Another factor to consider is the shape and size of your goggles. Different goggles have different lens curves, which can affect how they fit your eyes and how they correct your vision. Some goggles have spherical lenses, which have the same curvature in all directions. Others have cylindrical lenses, which have different curvatures horizontally and vertically. Cylindrical lenses can cause more distortion and glare, especially for people with astigmatism. The size of your goggles also matters, because it determines how much peripheral vision you have and how comfortable they are. Larger goggles tend to offer more peripheral vision, but they can also create more drag and pressure on your face. Smaller goggles tend to fit more snugly and securely, but they can also limit your field of view and cause more eye strain.

Type and quality of goggles The final factor to consider is the type and quality of your goggles. There are many types of goggles available for different purposes and preferences. For example, you can choose between clear, tinted, polarized, mirrored, or photochromic lenses, depending on the lighting conditions and your personal taste. You can also choose between single-vision, bifocal, or progressive lenses, depending on your age and vision needs. The quality of your goggles is also important, because it affects how durable, comfortable, and effective they are. You should look for goggles that are made of high-quality materials, such as polycarbonate or silicone, that are resistant to scratches, fogging, and UV rays. You should also look for goggles that have a good seal, a flexible nose bridge, and an adjustable strap, to ensure a proper fit and prevent leaks.

Summary To summarize, selecting the correct prescription for goggles involves knowing your current prescription, adjusting it for the distance and the refraction of water or air, choosing the right shape and size of goggles, and picking the best type and quality of goggles for your needs. By following these steps, you can enjoy clear vision and a comfortable experience in any activity that requires goggles.

Malmsten Goggles Malmsten Optisk Goggles offers customizable optical lenses that can be tailored to suit individual needs. The optical lens-assemble kit, which includes nose bridges, head strap, and clip, is sold separately, allowing swimmers to assemble their own custom swim goggles with different strengths per eye, hence it has been popular among swimmers. If you are looking for a quality and comfortable goggles which can be customised, Malmsten Optisk Goggle is just for you!

If you require more information on the goggles, feel free to contact us at

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